Cooler for reclaimed liquor and gas in paper-pulp processes.



PATENTBD PEB. 25,1808.

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G. P. SHEVLIN & E. D. SMALL. COOLER FOR REOLAIMED LIQUOR AND GAS IN PAPER PULP PROCESSES.

' APPLXOATION I;'ILED MAY 13, 1907.

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PATENTED PEB. 25, G. P. SHEVLIN & P. D. SMALL. COOLER POR REGLAIMBD LIQUOR AND GAS IN PAPER PULP PRDGESSBS..

APPLICATION FILED MAYlS, 1907.

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'UNITED sTATEs PATENT oEEIoE.

GEORGE F. SHEVLIN, OF SARATOGA SPRINGS, NEW YORK, AND FERDINAND D. SMALL, OF

WOODLAND, MAINE; SAID SHEVLIN ASSIGNOR TO BAKER & SHEVLIN COMPANY, OF SARA- rIOGA SPRINGS, NEW YORK, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed May 13. 1907. Serial No. 373.472.

To all whom it may concern:

Be it known that we, GEORGE F. SHEVLIN,

. a citizen of the United States, residing at Saratoga Springs, in the county of Saratoga and State of New York, and FERDINANDD. SMALL, a citizen of the United States, residing at Woodland, in the county of Washington and State of Maine, have invented an Improvement in Coolers for Reclaimed Liquor and Gas in Paper-Pnl Processes, of which the following is a speci cation.

In the process of making paper from wood and particularly the part of the process that relates to the pulp treated in suitable digesters by a liquor of well-known character, it is desirable to save such liquor and cool the same down to as near the temperature of water around the mill as possible and then to add fresh liquor to the re-claimed and cooled liquor to raise the percentage thereof for further use. In the operation of these digesters it is well-known that after the bisulfid liquors reach a certain temperature or degree of heat that the gas will leave the liquor, and it is therefore desirable to keep the acid and gas as cool as possible, and the object of our invention is the production of a cooling device of acid resisting metal that will take the hot liquor and gas from the digester through direct pipes, and after cooling deliver the same to the induction pipes and acid tanks at as low a temperature as possible, cooled by the water of a stream or spring caused to iiow through the cooler.

The device of our invention comprises a vessel of built up longitudinal sections flanged for connection; with corrugated sides, and transverse channels for cooling liquor, which with the sides provide a maximum of cooling surfaces to the water in which the vessel is immersed. The sections are of cast acid resisting metal or other suitable material, the channels being formed in pipes that are cast with the body of the vessel and placed vertically therein. The pipes may be of any desired shape in cross section.

The vessel has a flat bottom and a Hat top, a tapering throat and ends flanged for connection with inlet and exit pipes or other similar vessels in series. The vessel is received within a tank provided with tight sides, ends land bottom to hold the water, and. with an auxiliary bottom to receive and support the vessel in which are openings coinciding with the channels through the vessel.

The cooling water from any desired source fiows in between the two bottoms, preferably at one end and up through the channels, filling the tank and surrounding the vessel and over-flowing by a suitable spill-Way advantageously at the end opposite toits entrance. The hot bisulfid liquor and gas from the digesters flows through the vessel and is cooled and the gas condensed and so prepared for future use.

In the drawing, Figure 1 represents the device of our im rovement in a broken elevation and partia vertical section. Fig. 2in considerably larger size represents a partial plan and horizontal section of the cooling device alone. Fig. 3 is a vertical cross section showing the device of our improvement according to the preferred form shown in Fig. 2, together with the tank for cooling liquor. Fig. 4 is a plan and partial horizontal section of a modified form of our improvement and Fig. 5 is a vertical section throu h the modified form shown in Fig. 4 and a so showing the auxiliary supporting bottom of the tank. Figs. 6 and 7 are sections representing modifications.

The vessel for receiving the hot bi-suld liquor and gas from the digesters is made of any desired acid resisting metal or other suitable material, preferably cast and of longitudinal sections a b with a flat bottom throughout the entire length of the sections and the contracted ends and with a flat top throughout the entire length except the contracted ends.

al b1 are the upper and lower flanges of the longitudinal sections which come together and are secured by connecting bolts 2.

The vessels are preferably alike at each end, each longitudinal section being provided with contracted ends or necks c d and endflangesc1 d1. These flanges are adapted .to receive and be connected to suitable inlet and exit pipes or other similar vessels in series, and it will be noticed that the flanges al b1 eX- i tend the entire length of the vessels between the end-flanges cl d1 and that the bolts 2 placed at intervals secure the sections of the vessels together, and if desired the juxtaposed surfaces of these flanges may be formed in any desired manner or provided with an interposed backing so as to form a tight joint.

Between the contracted neck portions of the vessel the opposite vertical sides e f are corrugated and the vessels are provided with transverse pipes g h. These pipes are of elongated cross section, as will appear from Fig. 2,with rounded ends and the pipes that come next to the flanges, or in other words, along the central lines of the longitudinal sections, are half pipes g1 h1. These pipes are cast with sections extending between the top and bottom plates thereof and the channels formed by these pipes open out above and below the vessels. Substantially the only difference between the preferred form of our invention Fig. 2, and the modified form in Fig; 4, is in making the transverse pipes i round instead of elongated, with round ends, and the sides in the modified form Fig. 4 are not so deeply corrugated. r

We desire in this device to obtain a radiating surface for the hot liquor within the vessel and for the action of the external cooling water as great as possible,-therefore the vessel contains as many transverse pipes as can readily be formed therewith, and the sides are corrugated for the same reason and the extent of the corrugation is not material. It is quite essential however, that the vessel should be provided with a flat bottoml throughput so that all of the hot liquid contained therein may flow out, and we may prefer to set these vessels and their containing tank at a slight inclination so as to assist the gravity of flow of the liquor.

Figure 1 shows the flat bottom throughout and this figure together with Fig. 2, shows that the contraction of the neck is on three sides only, that is, on the top and the two opposite sides. In this way the neck provides sufficient space for the hot liquor and thevessel the maximum holding capacity and cooling surface for reducing the temperature of the liquor.

The tank that we have shown is preferably formed of the sides 7c l, the ends m n, a main bottom portion o, an auxiliary bottom portion r that is raised at an appreciable distance above the bottom portion o, and We provide the braces s which are placed at the ends and intermediately in the length of the tank to strengthen the auxiliary bottom and insure the support of the vessel. This auxiliary bottom is longitudinally channeled to receive the lower flanges 0,1 b1 of the vessel and it is provided with openings 3 4 which coincide in position and correspond in area to the openings of the transverse pipes, and which openings provide inlet channels for the cooling water which flows into the tank between the main and auxiliary bottom portions up through the openings 3 4 and through the channels of the pipes, filling the upper portion of the tank as well as the lower portion and entirely submerging the vessel and rising above the same and escaping over a suitable spill-way preferably formed at the end of the tank that is opposite to the inlet end for the water;

Figs. 3 and 5 clearly show the transverse construction of the tank and the openings 3 4.

The device of our improvement is shaped to receive the water from a spring or from a stream upon or adjacent to the mill site where the device .is employed, and the hot bi-sulfid liquor and gas which come from the digester in the process of forming paper pulp is passed through this vessel and cooled and the gas condensed and the liquor passed on to a suitable vessel for receiving the same, and in which it is mixed with fresh liquor so as to raise the percentage thereof for future use and effect economy in the process of treating paper pulp.

In the modifications of our invention shown in Figs. 6 and 7, both of which are partial cross sections, Fig. 6 represents two longitudinal side bearers 5 6 for supporting the vessel in the tank and which are in turn supported on the braces s consequently there is no auxiliary bottom, but the operation is identical with that liereinbefore described with reference to the principal structure. In Fig. 7 we have shown the flanges of the longitudinal sections as placed horizontally instead of vertically and the transverse pipes as horizontal instead of vertical and in this connection the auxiliary bottom is provided with perforations 7 8 near the sides lc l, the cooling Water filling the pipe channels but not entering the tank through them as in the principal structure.

We claim as our invention:

l. The combination with a suitable longitudinal tank for cooling water, of an openended vessel having a flat bottom, an auxiliary bottom to the tank for supporting the vessel, transverse pipes formed through the vessel, there being openings through the auxiliary bottom in line with the openings of the transverse pipes. so that the circulating water fills the channels ofthe pipes as well as the tank. 2. The combination with a suitable longitudinal tank for cooling water, of a vessel located within the tank and having a flat bottom with open ends on thesame level as the bottom, vertically disposed transverse pipes formed through the vessel, contracted necks to the vessel, a support in the tank for the vessel, and inlet and exit devices for the water whereby the vessel is submerged and the channels of which pipes fill with water.

3. A device for cooling re-claimed liquor and gas in paper pulp processes, comprising a vessel formed of two longitudinal flanged sections of suitable acid resisting material, means for connecting said sections together their flanges and for supporting the vessel,

and gas in paper pulp processes, comprising a vessel formed of' two longitudinal flanged sections of suitable acid resisting material, means for connecting said sections together at their flanges and for supporting the vessel, a flat bottom to said vessel throughout its entire length, contracted neck sections along which said flanges extend and end flanges to said necks and a flat bottom to the vessel providing for draining ofi all the liquor therein.

5. A device for cooling re-claimed liquor and gas in paper pulp processes, comprising a vessel formed of' two longitudinal flanged sections of suitable acid resisting material, means for connecting said sections together at their flanges `and for supporting the vessel, pipes cast with the sections and disposed vertically so that the channels of the pipes open above and below the vessel, a suitable tank for receiving said vessel and for supporting the same, and inlet and exit devices for cooling water, so constructed that the vessel is submerged in the water of the tank.

6. A device for cooling re-claimed liquor and gas in paper pulp processes, comprisinga vessel formed of two longitudinal flanged sections of suitable acid resisting material, means for connecting said sections together at their flanges and for supporting the vessel, a flat bottom to said vessel through-out its entire length, contracted neck sections along which said flanges extend, end flanges to said necks, a flat bottom to the vessel providing for draining off all the liquor therein, a suitable tank for receiving said vessel and for supporting the same, and inlet and exit devices for cooling water, so constructed that the vessel is submerged in the water of the tank. A

7. A cooler for hot bi-sulfid liquor and gas in the process of making paper pulp, comprising a vessel of two longitudinal sections, with edge ilanges formed of suitable acid resisting material, with vertically disposed corrugated sides, a flat top and flat bottom, vertically disposed transverse pipes formed with the top and bottom, with the channels and pipes opening above and below the vessel, the said pipes having rounded portions in cross section and contracted neck portions in said vessel each having a flat bottom formed as a prolongation of the bottom of the vessel, with the contraction formed at the sides and top and with end flanges for connection With inlet and exit pipes or other similar vessels in series, and bolts for connecting the sections of the longitudinal vessels together at the flanges.

8. A cooler for hot bi-sulfid liquor and gas in the process of making paper pulp,

BEST AVAILAisL-E COPY comprising a vessel of two longitudinal sections, with edge flanges formed of suitable acid resisting material, with vertically disposed corrugated sides, a flat top and flat bottom, vertically disposed transverse pipes vformed with the top and bottom, with the channels and pipes opening above and below the vessel, the said pipes having rounded portions in cross section and the pipes arranged in staggered series, and contracted neck portions in said vessel each having a flat bottom formed as a prolongation of the bottom of the vessel, with the contraction formed at the sides and top, and with end flanges for connection with inlet and exit pipes or other similar vessels in series, and bolts for connecting the sections of the longitudinal vessels together at the flanges.

9. A cooler for hot bi-sulfid liquor and gas in the process of making paper pulp, comprising a vessel of two longitudinal sections, with edge flanges formed of suitable acid resisting material, with vertically disposed corrugated sides, a Hat top and flat bottom, vertically disposed transverse pipes formed with the top and bottom, with the channels and pipes opening above and below the vessel, the said pipes having rounded portions in cross section and contracted neck portions in said vessel each having a flat bottom formed. as a prolongation of the bottom of the vessel, with the contraction formed at the sides and top and with end flanges for connection with inlet and exit pipes or other similar vessels in series, and bolts for connecting the sections of the longitudinal vessel together at the flanges, and a tank for holding cooling water, comprising sides, ends, a main bottom portion, an auxiliary bottom portion above the same, which latter is provided with a longitudinal channel to receive the longitudinal flange of the vessel so that the flat bottom of the vessel rests upon the auxiliary bottom 4of the tank and the said auxiliary bottom is provided with openings 3 4 converging in position and corresponding in dimensions with the openings or channels of the pipes, and means for supplying water between the main and auxiliary bottoms to pass up through the openings in the auxiliary bottom and channels of the pipes so as to fill the tank and immerse the vessel.

10. The combination with a suitable longitudinal tank for cooling Water, of a vessel located within the tank having a ilat bottom and open ends thereto on the same level as the bottom, a support for said vessel in said tank, transverse pipes formed through the vessel and through which the cooling water passes from the tank below the vesselto surround the vessel and submerge the same.

11. The combination with a suitable longitudinal tank for cooling water, having an auxiliary bottom dividing the tank up into two compartments, of an open-ended vessel having a 'fiat bottom resting upon said auxiliary bottom for support, transverse pipes formed through the said vessel and filled with the cooling water, and channels formed through the auxiliary bottom permitting the cooling water to lill' both compartments of the tank.

12. The combination with a suitable longitudinal tank for cooling water, of a vessel having a flat bottom and open ends thereto on the same level as the bottom, vertically disposed transverse pipes formed through the vessel, a support in the tank for the vessel and inlet and exit devices and passageways for the water, whereby the vessel is submerged and the said pipes filled with water.

13. In a device of the character described and in combination, a suitable longitudinal tank for cooling water, an auxiliary bottom to the tank, a vessel disposed longitudinally throughout the tank, having a iiat bottom resting upon the auxiliary bottom of the tank, contracted necks to the vessel which extend toward and through the ends thereof with the mouths of the vessel outside the ends of the tank.

14. In a device of the character described and in combination, a suitable longitudinal tank for cooling water, an auxiliary bottom to the tank, a vessel disposed longitudinally throughout the tank, having a flat bottom resting upon the auxiliary bottom of the tank, contracted necks to the vessel which esta@ extend toward and through the endslthereoi disposed transverse pipes formed through the vessel and coinciding with similarly shaped,` e

apertures extending through the auxiliary bottom of the tank whereby the vessel is sub merged, the water entering below iiowing up through the said apertures and pipes.

15. Ink a device of the character described and in combination, a suitable longitudinal tank for cooling water, an auxiliary bottom to the tank, a vessel disposed longitudinally throughout the tank, having a fiat bottom resting upon the auxiliary bottom of the tank, contracted necks1v to the vessel which extend ktoward and through the ends thereof with the mouths of the vessel outside the ends of the tank and the opposite vertical sides of said vessel corrugated so as to pre u sentV an increased area to the cooling water surrounding the vessel, and transverse pipes extending through the vessel for the cooling water and apertures through the auxiliary bottom alining said pipes providing for the circulation of the Water from the lower to the upper parts of the tank,

Signed by us this 7th day of May, 1907.

ono. r. sHEvLiN'. F. D. SMALL,

Witnesses:

GEO. T. PINCKNEY, E. ZACHARIASEN. 

